This WaterSense® -labeled tank combines water efficiency with the versatile style of the Cimarron collection. A 1.28 gal flush provides significant water savings of up to 16,500 gallons per year, compared to a 3.5 gal toilet, without sacrificing performance. This tank features innovative AquaPiston technology, a patented flush engine that delivers a fast, powerful and virtually plug-free flush. Pair this tank with the K-4309 bowl for a complete toilet. Kohler® Toilet Tank, High Efficiency, Cimarron®, 1.28 gpf, Left Hand Lever Flush, 2 in Flush Valve, 13-9/16 in Height, 17-5/8 in Width, 8 in D, Vitreous China, Dune